JP2005198586A - Sulky mower - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sulky mower facilitating the operation under a tree, or the like, despite having a rollover protective frame 30 and a freely lifted and lowered grass-collecting container 15. <P>SOLUTION: The rollover protective frame 30 is linked so as to be freely turned and changed to a standing usable state or a lodging state. When the rollover protective frame 30 is interlocked with an upper link member 14a of a link structure 14 by a locking pin 37, the rollover protective frame 30 is changed to the lodging state by being interlocked with the link structure 14 and being turned to the rear side of a machine body when the grass-collecting container 15 is operated so as to be lowered, and the rollover protective frame 30 is changed to the standing usable state by being interlocked with the link structure 14 when the grass-collecting container is operated so as to be lifted. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a fall protection frame provided at the rear part of a self-propelled vehicle body, and a riding-type mowing machine provided with a grass collecting container that is connected to the rear part of the self-propelled vehicle body through a link mechanism that can swing up and down. .

  As the above-described riding-type mower, conventionally, as shown in Patent Document 1, for example, a fall protection frame 46 is erected at the rear part of the traveling machine body 1 (corresponding to a self-running vehicle body), and an elevating link mechanism 49 is provided on the fall protection frame 46. In some cases, the grass collection container 32 is connected to be freely moved up and down.

  Conventionally, as shown in Patent Document 2, for example, the fall protection frame 7 is rotatably connected to the support frame 19, and the standing posture U and the retracted posture D swinging from the standing posture U to the vehicle body rear side are disclosed. In addition, there was a technology that made it possible to switch by human operation.

JP 2003-274730 A ([0028] column, FIG. 1)

JP 10-324210 A ([0019] column, FIG. 3 etc.)

  In a riding-type mower equipped with a fall protection frame, the fall protection frame hits a tree, so that it may not be possible to work under the tree. If the fall protection frame is made swingable by adopting the above-mentioned conventional technology, even if it is under a tree, the fall protection frame is switched from a standing use state to a state where it swings to the rear side of the vehicle body, etc. By avoiding hitting, you will be able to work. In this case, when raising the collection container such as discharging the cut grass stored in the collection container, avoid the situation where the link mechanism hits the fall protection frame and the collection container does not rise to the required height. Therefore, it is necessary to return the fall protection frame that has been swung to the rear side of the vehicle body to the standing use state.

  Therefore, when using the conventional technology to change the posture of the fall protection frame, when working under trees, etc., if it is necessary to raise the grass collection container, the fall protection frame must be The troublesome work of switching from the standing use state to the swinging state to the rear side of the vehicle body or returning to the standing use state is required. In addition, labor for changing the posture was required.

  An object of the present invention is to provide a riding mower that can be easily operated from the viewpoint of changing the position of a fall protection frame under a tree or the like, and can be obtained with a simple structure.

  According to the first aspect of the invention, there is provided a fall protection frame provided at the rear portion of the self-propelled vehicle body, and a grass collecting container that is connected to the rear portion of the self-propelled vehicle body so as to be movable up and down via a link mechanism that can swing vertically. In the riding type mower, the fall protection frame is configured to swing freely between a standing use state and a lying state swinging from the standing use state to the rear side of the vehicle body, and the rocking mechanism for raising the grass collecting container of the link mechanism. The link so that the overturn protection frame is switched to the standing use state in conjunction with movement, and the overturn protection frame is switched to the overturned state in conjunction with swinging to lower the grass collection container of the link mechanism. Interlocking means for interlocking the mechanism with the fall protection frame is provided.

  That is, the grass collection container is lowered when performing lawn mowing and mowing work. When the grass collection container is lowered, the fall protection frame is linked to the link mechanism by the interlocking means. Swing to switch from standing use to lying down. When the grass collecting container is lifted, the fall protection frame swings in conjunction with the link mechanism for interlocking with the link mechanism by the interlocking means, and switches from the lying down state to the standing use state.

  Therefore, according to the first aspect of the invention, under the tree, the fall protection frame can be operated in a lying state so as not to hit the tree etc., and when the grass collection container is raised, the fall protection frame is linked. The grass collection container can be raised to a required height in a standing use state so as not to disturb the operation of the mechanism. Moreover, the power of the link mechanism can be used for the swinging operation force of the overturn protection frame, and the overturn protection frame can be switched to the desired posture state easily and easily by simply moving the grass container up and down. The structure can be obtained simply by omitting the power means.

  According to the second aspect of the invention, in the configuration of the first aspect of the invention, the interlocking unit is configured so that the link mechanism and the overturning protection frame are interlocked with each other, and the linkage between the link mechanism and the overturning protection frame is cut off. The lock means is configured to be switchable to a state, and is switchable between a lock state in which the fall protection frame is fixed in the upright use state and a lock release state in which the fall protection frame is released from being fixed upright.

  That is, when the fall protection frame is fixed to the standing use state by the lock means and the interlocking means is switched to the cut state, the fall protection frame is raised so that the fall protection frame does not switch to the fallen state even if the grass container is lowered. It can be kept in use.

  Therefore, according to the second aspect of the present invention, when working under a tree or the like, the fall protection frame can be changed in posture by the link mechanism. It is possible to work while being fixed in the standing use state.

  According to the third aspect of the invention, in the configuration of the first or second aspect of the invention, the link member of the link mechanism and the overturn protection frame are attached to be swingable around the same axis.

  In other words, since the link member of the link mechanism and the fall protection frame are swingably attached around the same axis, an interlocking pin that is detachable across the link member and the fall protection frame is employed as the interlocking means. The link mechanism and the fall protection frame can be interlocked and this interlock can be released.

  Therefore, according to the third aspect of the present invention, a simple structure means such as an interlocking pin can be adopted as the interlocking means and can be obtained at low cost.

Embodiments of the present invention will be described below with reference to the drawings.
As shown in FIG. 1, a pair of left and right caster wheel type free-wheeling front wheels 1 and a pair of left and right driveable rear wheels 2 are configured to be self-propelled, and a driver seat 3 and a pair of left and right wheels Of a vehicle body frame 7 of a self-propelled vehicle body equipped with a boarding type driving unit 5 equipped with a control lever 4, a driving unit 6 positioned behind the driver seat 3, and a fall protection frame 30 positioned behind the driving unit 5. The mower 20 is connected between the front and rear wheels via a link mechanism 8, and the driving force of an engine (not shown) located in the driving section 6 is transmitted to the mower 20 via the rotary shaft 9, the transmission mission 10, and the rotary shaft 11. The grass collection container 15 is connected to the rear portion of the vehicle body frame 7 via the link mechanism 14, and a cut grass discharge port (not shown) of the housing 23 of the mower 20 is provided. Left and right rear wheels 2, 2 Configured so as to communicate with the grass collection container 15 through the transfer duct 16 through the, you have configured riding mower.

  This riding-type mowing machine is used for mowing and mowing, and transmits a pair of hydrostatic continuously variable transmissions (not shown) that transmit the driving force of the engine located in the prime mover 6 to the left and right rear wheels 2 and 2 separately. 1) is operated by the pair of control levers 4 and 4, and the left and right rear wheels 2 and 2 are driven and stopped to run and stop the vehicle body, thereby making the driving speeds of the left and right rear wheels 2 and 2 different. By doing so, the steering operation of the vehicle body is performed. A mower lift cylinder (not shown) is linked to the rear link 8a of the link mechanism 8. By operating the mower lift cylinder, the link mechanism 8 swings up and down with respect to the vehicle body frame 7 by the mower lift cylinder. The mower 20 is moved up and down to a lowering work state in which the gauge wheel 24 mounted on the housing 23 is grounded and to a non-working state in which the gauge wheel 24 floats high above the ground. ing.

  The link mechanism 14 for connecting the grass collecting container 15 is provided on both lateral sides of the self-propelled vehicle body. As shown in FIGS. An upper link member 14a having a front end connected to an upper end side of a link support portion 12a positioned at an upper end portion of a support frame 12 erected on the side so as to be rotatable around an axis P1 in a lateral direction of the vehicle body, the link support portion The lower link member 14b, the left link mechanism 14 and the upper link member 14a of the right link mechanism 14 and the lower link member are connected to the lower end side of 12a so that the front end side is rotatable around the axis P2 parallel to the axis P1. The rear end side of the link member 14b is provided with a container support 14c that is rotatably connected.

  The container lift cylinder 13 of the left link mechanism 14 and the container lift cylinder 13 of the right link mechanism 14 are connected over the support frame 12 and the lower link member 14b, and the left link mechanism 14 is also on the right side. The link mechanism 14 is also oscillated up and down around the shaft cores P1 and P2 with respect to the support frame 12 by the container lift cylinder 13 and is lowered as shown in FIG. Thus, the grass collecting container 15 is lowered near the rear of the self-propelled vehicle body, and is raised as shown in FIG. 2, whereby the grass collecting container 15 is raised upward behind the prime mover 6. Yes.

  The container support 14c supports the grass collection container 15 so as to be rotatable in the vicinity of the grass outlet / inlet 15a and includes a dump cylinder 17. That is, when the dump cylinder 17 is operated, as shown in FIG. 2, the grass collection container 15 rises and swings with respect to the container support 14c, opens the weeding-in / out opening 15a downward, and drops the cut grass inside. As shown in FIG. 1, the grass collection container 15 is lowered and swung with respect to the container support 14c, and the grass outlet 15a is brought into contact with the container support 14c.

  That is, when the container lift cylinder 13 and the dump cylinder 17 are operated, the link mechanism 14 is swung up and down with respect to the support frame 12 by the container lift cylinder 13 to lower the grass collection container 15 near the rear of the vehicle body, 6, the grass collection container 15 is swung up and down with respect to the container support 14 c by the dump cylinder 17, and the grass collection container 15 has the grass inlet / outlet 15 a through the opening of the container support 14 c. A descending grass collection state communicated with the transport duct 16 or a rising grass removal state in which the grass cut-in / out opening 15a is opened downward to drop the cut grass and the cut grass inside.

  That is, when the mower 20 is lowered to the descending work state, the self-propelled vehicle body is driven with the grass collecting container 15 in the descending grass collection state, the mower 20 is vertically directed at a plurality of locations in the lateral direction of the vehicle body inside the housing 23. The blade 25 that rotates about the axis of the blade cuts the turf and grass, and the cut grass and cut grass are discharged from the housing 23 to the transfer duct 16 by the transfer air generated by the rotation of the blade 25, and passed through the transfer duct 16. It is fed into the grass collection container 15. By operating the grass collection container 15 to the ascending weeding state, the cut grass and cut grass stored in the grass collection container 15 can be discharged.

  As shown in FIG. 5 and the like, the overturn protection frame 30 is configured by a square steel pipe material that is bent and formed in a portal shape with an intermediate portion extending in the lateral direction of the vehicle body. Of the connecting portions 31 provided by attaching sheet metal members to both ends of the bent-angle steel pipe material, the left connecting portion 31 is connected to the supporting portion 12a of the left supporting frame 12, and the right connecting portion 31 is provided. Each of the right support frames 12 is connected to the support portion 12a so as to be rotatable by using a connection pin 32 for connecting the upper link member 14a of the link mechanism 14. Thus, the overturn protection frame 30 is attached to the left and right support frames 12 so as to swing in the vehicle longitudinal direction about the same lateral axis P1 as the upper link member 14a. By being operated, as shown in FIG. 3 (b), the leg portions 32 on both ends of the fall protection frame 30 are aligned in a straight line with respect to the support frame 12, and as shown in FIG. 3 (a). The vehicle is switched from the standing use state to a lying state where the ground height is lower than that in the standing use state by swinging backward from the vehicle body.

  As shown in FIG. 5, a pair of pin holes 34 and 35 are provided in the connecting portion 31 of the overturn protection frame 30 on both ends of the overturn protection frame 30, and one pin hole 34 of the connection portion 31 and the upper portion are provided. The interlocking pin 37 is configured to be attached to and detached from the pin hole 36a of the interlocking member 36 provided in the link member 14a, and the lock pin 39 is extended to the other pin hole 35 of the connecting portion 31 and the pin hole 38 of the support frame 12. It is configured to be detached.

  As shown in FIG. 4, the lock pin 39 is mounted over the connecting portion 31 and the support frame 12 so that the fall protection frame 30 is engaged with the support frame 12 so as not to swing. As shown in FIG. 3, the lock is released so that the fall protection frame 30 is released from being fixed by being removed from the connecting portion 31 and the support frame 12. It becomes a state.

  As shown in FIG. 3, the interlocking pin 37 is mounted across the connecting portion 31 and the interlocking member 36, so that the overturn protection frame 30 engages with the upper link member 14a and swings in conjunction with the link mechanism 14. As shown in FIG. 4, the fall protection frame 30 and the link mechanism 14 are linked to each other in a moving state. By disengaging the upper link member 14a, the interlocking state is brought about so as to cancel the interlocking between the fall protection frame 30 and the link mechanism 14.

  That is, when working under a tree, the lock pin 39 is switched to the unlocked state and the interlocking pin 37 is switched to the interlockingly inserted state on both ends of the fall protection frame 30. Then, when performing lawn mowing or mowing, as shown in FIG. 1, the fall protection frame 30 swings the link mechanism 14 that lowers the grass collection container 15 simply by lowering the grass collection container 15 into the lowered grass collection state. The fall protection state 30 is switched in conjunction with the fall protection frame 30 and the work can be performed while it is difficult for the fall protection frame 30 to hit the tree. Then, when discharging the cut grass and cut grass collected in the grass collection container 15, as shown in FIG. 2, when the grass collection container 15 is raised to the upward discharge state, the overturn protection frame 30 causes the grass collection container 15 to move. It is possible to switch to the standing use state in conjunction with the swing of the link mechanism 14 to be raised, and the fall protection frame 30 can raise the grass collection container 15 to a required height without becoming an obstacle to the swing of the link mechanism 14. Become.

  At work places where no tree or the like is above, the lock pin 39 is switched to the locked state and the interlocking pin 37 is switched to the interlocking cut off state at both ends of the fall protection frame 30. Then, as shown in FIG. 4 (a), even if the grass collection container 15 is lowered, the overturning protection frame 30 does not switch to the overturned state, and it is possible to work while fixing the overturning protection frame 30 to the upright use state. .

The pair of left and right front wheels 1 and 1 are mounted by the mounting structure shown in FIG.
That is, the mounting shaft portion 40b of the front wheel support 40 that supports the front wheel 1 by the bifurcated portion 40a is rotatably inserted into the boss portion 41a of the front wheel support frame 41 extended from the vehicle body frame 7. The retaining screw body 42 attached to the end portion of the attachment shaft portion 40b is prevented from coming off.
A thrust washer 43 disposed on both upper and lower sides of the boss portion 41a, and a plurality of disc-shaped spring members 45 disposed between the upper thrust washer 43 and the screw washer 44 are respectively attached to the mounting shaft portion 40b and prevented from coming off. Each of the disc-shaped spring members 45 is elastically deformed by the tightening force of the screw body 42, and the front wheel support 40 is pressed against the boss portion 41a via the thrust washer 43 by the elastic restoring force of the disc-shaped spring member 45. The rotation of the mounting shaft 40b of the front wheel 1 with respect to the front wheel support frame 41 about the vertical axis of the vehicle body is predetermined so that 1 does not rotate too much about the vertical axis of the mounting shaft 40b. The frictional rotation resistance is provided.

[Another embodiment]
The object of the present invention can be achieved by implementing the interlocking pin 37 and the lock pin 39 as in the above embodiment, or by employing the interlocking and locking hook, the link mechanism, the connecting rod, and the like. it can. Accordingly, the interlocking pin 37, the lock pin 39, the hook, the link mechanism, the connecting rod, etc. are collectively referred to as the interlocking means 37 and the locking means 39.

Side view of the riding mower as a whole Side view showing rising weeding condition of grass collection container (A) is a side view showing a lying state when interlocked with the link mechanism of the fall protection frame, and (b) is a side view showing a standing use state when interlocking with the link mechanism of the fall protection frame. (A) is a side view showing the lowered state of the link mechanism with the fall protection frame fixed in the standing use state, and (b) is the rise of the link mechanism with the fall protection frame fixed in the standing use state. Side view showing condition The perspective view which shows the attachment structure of a fall protection frame and a link mechanism Sectional view showing front wheel mounting structure

Explanation of symbols

14 Link mechanism 14a Link member 15 Grass container 30 Fall protection frame 37 Interlocking means 39 Lock pin P1 Fall protection frame and swing axis of link member

Claims (3)

A riding-type mowing machine comprising a fall protection frame provided at the rear part of the self-propelled vehicle body, and a grass collecting container that is connected to the rear part of the self-propelled vehicle body through a link mechanism that can swing up and down freely.
The fall protection frame is configured to freely swing between a standing use state and a fallen state swinging from the standing use state to the rear side of the vehicle body,
The overturn protection frame is switched to the standing use state in conjunction with the swing of raising the grass collecting container of the link mechanism, and the overturn protection frame is interlocked with the swing of lowering the grass collection container of the link mechanism. A riding-type mower provided with interlocking means for interlocking the link mechanism and the overturn protection frame so as to switch to the overturned state.   The interlocking means is configured to be switchable between an on state in which the link mechanism and the overturn protection frame are interlocked and a state in which the linkage of the link mechanism and the overturn protection frame is cut off, and the overturn protection frame is used in the upright state. The riding-type mowing machine according to claim 1, further comprising lock means that can be switched between a locked state in which the fall protection frame is fixed and a lock released state in which the standing protection of the fall protection frame is released.   The riding type mower according to claim 1 or 2, wherein the link member of the link mechanism and the fall protection frame are swingably mounted around the same axis.

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